$266+ Cheap flights from Decatur, IL to San Diego (DEC - SAN)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SAN
Nov 29 — Dec 61
Round-trip
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Decatur to San Diego
Cheapest
Best
Last-minute
One-way
Cheapest flights from Decatur to San DiegoExplore the most affordable flight options available from Decatur to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
Explore the most affordable flight options available from Decatur to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
This United Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/197:03 pm -
1 stop29h 52m
Tue 12/222:45 pm -
2 stops15h 58m
Deal found 10/27![United Airlines logo]()
$494
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/107:02 pm -
1 stop18h 25m
Sat 11/146:50 am -
1 stop23h 19m
Deal found 10/26![United Airlines logo]()
$544
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/209:10 am -
1 stop8h 02m
Mon 11/236:50 am -
1 stop9h 20m
Deal found 10/30![United Airlines logo]()
$549
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/139:10 am -
2 stops10h 05m
Tue 11/174:01 pm -
2 stops14h 08m
Deal found 10/29![United Airlines logo]()
$579
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/187:03 pm -
1 stop29h 52m
Sun 12/204:20 pm -
1 stop14h 23m
Deal found 10/29![United Airlines logo]()
$1,264
Best flights from Decatur to San DiegoDiscover carefully curated flight deals from Decatur to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
Discover carefully curated flight deals from Decatur to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/97:00 pm -
1 stop29h 37m
Tue 1/127:41 pm -
2 stops20h 25m
Deal found 10/29![United Airlines logo]()
$490
This United Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/197:03 pm -
1 stop29h 52m
Tue 12/222:45 pm -
2 stops15h 58m
Deal found 10/27![United Airlines logo]()
$494
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:57 pm -
1 stop25h 42m
Tue 11/176:50 am -
1 stop23h 19m
Deal found 10/29![United Airlines logo]()
$544
Last-minute flights from Decatur to San DiegoDiscover last-minute flight deals from Decatur to San Diego. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from Decatur to San Diego. Data last updated October 30, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/107:02 pm -
1 stop18h 25m
Sat 11/146:50 am -
1 stop23h 19m
Deal found 10/26![United Airlines logo]()
$544
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/139:10 am -
2 stops10h 05m
Tue 11/174:01 pm -
2 stops14h 08m
Deal found 10/29![United Airlines logo]()
$579
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/209:10 am -
1 stop8h 02m
Mon 11/236:50 am -
1 stop9h 20m
Deal found 10/30![United Airlines logo]()
$549
One-way flights from Decatur to San DiegoSearch for one-way flight options from Decatur to San Diego. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
Search for one-way flight options from Decatur to San Diego. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
This United Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/206:57 pm -
1 stop29h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![United Airlines logo]()
$266
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/187:03 pm -
1 stop29h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![United Airlines logo]()
$706
Find flight deals from Decatur to San Diego
Discover tips and strategies to find the most affordable flight options for your journey from Decatur (DEC) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $484 (United Airlines) |
One-way from | $266 (United Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from Decatur to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 30, 2026.
Use the filters below to find and compare flights from Decatur to San Diego that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Fri 11/20
6:57 pm-10:40 pm
1 stop29h 43m
San Diego
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$266
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Sat 1/9
7:00 pm-10:37 pm
1 stop29h 37m
San Diego
Tue 1/12
7:41 pm-6:06 pm
2 stops20h 25m
$490
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Sat 12/19
7:03 pm-10:55 pm
1 stop29h 52m
San Diego
Tue 12/22
2:45 pm-8:43 am
2 stops15h 58m
$494
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Fri 11/13
6:57 pm-6:39 pm
1 stop25h 42m
San Diego
Tue 11/17
6:50 am-8:09 am
1 stop23h 19m
$544
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Fri 12/18
7:03 pm-10:55 pm
1 stop29h 52m
San Diego
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$706
Sorted by cheapest first
- Most accurate provider: When it comes to deals on Decatur, Illinois-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Decatur, Illinois-San Diego flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Decatur, Illinois-San Diego flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Decatur, Illinois-San Diego flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Decatur, Illinois-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Decatur to San Diego
Have a flexible travel schedule? Discover the best time to fly to San Diego from Decatur with our price prediction graph.
DEC-SAN
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Reviews of airlines servicing San Diego
Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated October 30, 2026.
Read reviews from past customers who have flown United Airlines from Decatur to San Diego. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.3
Crew
8.1
Food
6.7
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Reviews
1 / 20
4.0
OkaySimon,Jun 2024
LAS - LAX
Overall
7.3
Crew
8.1
Food
6.7
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Reviews
1 / 20
4.0
OkaySimon,Jun 2024
LAS - LAX
Related info for your journey
Find useful and relevant information for your journey from Decatur to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Diego?
Book flights to San Diego if you plan to visit one of these locationsEl Cajon
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Decatur and San Diego flights
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Top airline flying from Decatur to San Diego
Discover the top airline that operate flights from Decatur to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$324 | Average$450 | FlexibilityNo cancel fee | On-time69% |